If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

ALC68 PSU schematics

I've just acquired a number of ALC lasers including an ALC68 with the ALC PSU; apparently the PSU had a meltdown, so it's been modified to run with an external choke, presumably as an AC current limiting device. I would like to try and rebuild the PSU as it was, although I have to admit to not yet opening it up to see if anything's been removed. If someone can point me in the direction of the schematics for the PSU, I would greatly appreciate it.

The alternative would be to buy a Meditec EIL-4000, as there are a couple of those for sale not too far from me at the moment, but they're not particularly cheap, so I would prefer to attempt a repair on the ALC PSU.

Well I made a low offer for one of the EIL-4000s and I've now got it sitting on my bench!
Looks like my time will be better spent setting this up to run the 68 than trying to reinstate the original ALC PSU.
I've read Steve's cautions regarding running the 68 on this PSU, and I've also found some old posts that give some guidance; goinf to spend some time tomorrow doing research. Job no. 1 is probably to replace the AC input connector as I don't have anything that will connect to the original!

Something is a little odd with the PSU I have; the notes I've found (from LaserFX.com) indicate that terminal strip 2 pins 10 + 11 are the interlock connections to the head, however my PSU doesn't have a connection to pin 11!
I managed to locate a few schematics, although they are poorly scanned and have bits missing, unfortunately the crucial area is one of the missing bits. If anyone knows the variations of the EIL-4000 PSU, I would appreciate some guidance.

Someone in the UK did a complete tear-down and rebuild on an ALC 68B PSU several years ago. I can't remember who did it though! Still, if you can find that thread, the guy who did the work more than likely has the info you're looking for.